In a medium saucepan, heat olive oil.
Add onions, stir until the edges begin to golden.
Add whole can of tomato sauce, and stir so the onion flavor is absorbed.
Spoon in crushed garlic and basil, stir.
Cover and let simmer on medium to low heat for a good 10-15 minutes.
Uncover, add vegan brown sugar and stir. The vegan brown sugar gives the sauce a gorgeous color and a surprisingly delicious taste.
At this point, I taste the sauce to see if I need to add a little more basil or vegan brown sugar. Cover, and let simmer for another 10-15 minutes.
Serve with spaghetti, and enjoy!